Cause: The template was not created by using Office for Mac on a Macintosh computer.
 | Solution: On your Mac, open and resave the template, overwriting the original template if necessary. |
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On the File menu, click Open, locate the template that you want to load, and then double-click it.
To find templates that you saved in the My Templates folder, go to
/Users/username/Library/Application Support/Microsoft/Office/User Templates/My Templates. Office for Mac
built-in templates are located at
/Applications/Microsoft Office 2011/Office/Media/Templates.
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On the File menu, click Save As.
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On the Format pop-up menu, click PowerPoint Template (.potx).
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Click Save.
This replaces the original template with the newly saved version of the template.
Cause:
The hard disk is full.
 | Solution: Delete some files from your hard disk, or move them to another disk. |
After you move files to the trash, make sure that you empty the trash to delete them from your hard disk.